JP6063802B2 - Fireproof structure and fireproof device of fireproof double layer pipe - Google Patents

Description

  The present invention relates to a fireproof double-layer fireproof structure and a fireproof device used for drainage and ventilation in buildings such as apartment houses.

  In a building where a large number of people live such as an apartment house and an office building, floor partitions and ceiling partitions (concrete slabs) and the like can be cited as fire-proofing sections that should not spread during a fire.

  On the other hand, drainage pipes and ventilation pipes are arranged through the fire prevention section, so the pipes that pass through the penetration part are fireproof so that flames and smoke do not reach the adjacent areas beyond the fire prevention section. Structure is adopted.

  For example, the fire prevention structure of the pipes shown in Patent Documents 1 and 2 below, the pipe joint is arranged in the penetration part of the concrete slab as the fire prevention section, and the outer periphery of the connection end of the pipe connected to the pipe joint, A heat-insulating thermal expansion member that expands when overheated is mounted. And in the unlikely event that a fire occurs, the thermal expansion member expands due to the heat of the fire, so that the pipe line of the piping is blocked and flame and smoke are prevented from being transmitted to the adjacent section. .

  The piping used for this fireproof structure is made of, for example, a hard synthetic resin such as polyvinyl chloride resin. At the time of a fire, the piping material (synthetic resin) carbonized by combustion and a thermally expanded thermal expansion member shield it. The flame and heat insulation are ensured.

JP-A-9-152065 JP 2010-90542 A

  2. Description of the Related Art Conventionally, in the technical field related to fire prevention of piping for apartment buildings, it is needless to say that improvement in fire prevention properties such as flame shielding and heat insulation during a fire is as much as possible. For example, in order to improve the fireproofing property at the time of fire, it is conceivable to separately incorporate other fireproofing means in addition to the above thermal expansion member. However, if it does so, the subject that the complexity of a structure and the increase in cost will be caused by incorporating another fire prevention means.

  The present invention has been made in view of the above problems, and has a fireproof double-layer pipe fireproof structure capable of improving the flame insulation and heat insulation properties at the time of fire while simplifying the structure and reducing the cost. And to provide a fire protection device.

  In order to solve the above problems, the present invention comprises the following means.

[1] A fireproof double-layer fireproof structure in which a fireproof layer composed of a fireproof material is provided on the outer periphery of a heat-meltable inner pipe,
A fireproof structure for a fireproof two-layer pipe, wherein a fireproof device including a heat-insulating thermal expansion member that expands and closes a pipe line when overheated is provided on the outer periphery of the fireproof layer in the fireproof two-layer pipe.

  [2] The fireproof double-layer pipe fireproof structure according to [1], wherein the fireproof device includes a metal holding member that covers an outer periphery of the thermal expansion member and holds the thermal expansion member.

[3] A pipe joint connected to an end of the fireproof double-layer pipe is provided,
The fireproof structure of the fireproof two-layer pipe according to the preceding item 1 or 2, wherein the fireproof device is supported by the pipe joint.

[4] An upper end portion of the fireproof double-layer pipe disposed along the vertical direction is connected to the pipe joint,
The fireproof structure of the fireproof two-layer pipe according to the preceding item 3, wherein the fireproof device is hung on the pipe joint by hooking a hook attached to the outer peripheral surface of the fireproof apparatus.

  [5] The fireproof structure for a fireproof double-layered tube according to any one of the aforementioned Items 1 to 4, wherein the fireproof layer is formed of a porous sheet impregnated with a fireproof material.

  [6] The fire-resistant double layer according to any one of 1 to 5 above, wherein a sound-absorbing layer formed of a porous sheet is provided between the inner tube and the fire-resistant layer in the fire-resistant double-layer tube. Fire prevention structure of the pipe.

[7] A fireproof device attached to a fireproof two-layer pipe provided with a fireproof layer made of a fireproof material on the outer periphery of a heat-meltable inner pipe,
A fireproof device comprising a heat insulating thermal expansion member provided on an outer periphery of the fireproof layer in the fireproof two-layer tube and expanding when overheated to close the pipe.

  According to the fireproof structure of the fireproof two-layer pipe of the invention [1], since the thermal expansion member is provided outside the fireproof layer in the fireproof two-layer pipe, the fire resistance of the fireproof layer is accompanied by the expansion of the thermal expansion member at the time of fire. The material is crushed, and the pipeline is closed by the mixing member in which the crushed refractory material is mixed into the thermal expansion member. Since the refractory material in the mixing member has sufficient fire resistance, it can improve fire resistance and flame barrier properties, and also functions as an aggregate and reinforcing material. Problems can be prevented, and fire resistance can be further improved. In addition, fire resistance is improved by using the fire-resistant material that constitutes the fire-resistant double-layer pipe, so there is no need to use a new fire-proof material, which simplifies the structure and reduces costs. Can be planned.

  According to the fireproof structure of the fireproof double-layer pipe of the invention [2], the thermal expansion member can be reliably held, and the thermal expansion member can be prevented from expanding outward by the holding member at the time of a fire, and the thermal expansion member can be reliably It can be inflated inward, and the pipe line can be closed more reliably.

  According to the fire prevention structure of the pipes of the inventions [3] and [4], it is possible to reliably attach the fire prevention device at a predetermined position by using a flange of a pipe joint or the like.

  According to the fireproof structure of the fireproof two-layer pipe of the inventions [5] and [6], the porous sheet is crushed along with the expansion of the thermal expansion member at the time of fire, and the crushed porous sheet together with the refractory material is a thermal expansion member. The pipe line is blocked by the mixing member mixed in. The porous sheet in the mixing member also functions as a holding base material and a reinforcing material for holding the refractory material and the thermal expansion member, so that the shape of the mixing member that closes the pipe is stable and prevents problems such as collapse. And fire resistance can be further improved.

  According to the fireproof device of the invention [7], the same effect as described above can be obtained when it is adopted in a fireproof double-layer pipe.

FIG. 1 is a cross-sectional view showing a pipe connection structure to which a fireproof structure of a fireproof double-layer pipe according to an embodiment of the present invention is applied. FIG. 2 is a perspective view showing a fire prevention device applied to the pipe connection structure of the embodiment.

  FIG. 1 is a cross-sectional view showing a pipe connection structure to which a fireproof structure of a fireproof double-layer pipe according to an embodiment of the present invention is applied. As shown in the figure, in this pipe connection structure, a joint pipe joint 7 disposed around a pipe through-hole of a concrete slab serving as a fireproof section, and a fireproof two pipe as a pipe connected to the joint pipe joint 7 are used. A laminar pipe 1 and a fire prevention device 5 provided in the vicinity of the collecting pipe joint 7 in the fireproof two-layer pipe 1 are provided as basic components.

  The fireproof double-layer tube 1 includes an inner tube 2 and a cladding tube 3 laminated on the outer peripheral surface of the inner tube 2. The cladding tube 3 includes two layers, a sound absorbing layer 31 disposed on the inner peripheral side and a fireproof layer 32 disposed on the outer peripheral side. As will be described in detail later, the refractory layer 32 is constituted by a porous sheet 42 for a refractory layer impregnated with a refractory material, and the sound absorbing layer 31 is not impregnated with a refractory material (non-impregnated with a refractory material). Of) the sound absorbing layer porous sheet 41.

  The inner pipe 2 is composed of a synthetic resin pipe. Suitable examples of the synthetic resin pipes include thermoplastic resin pipes such as rigid polyvinyl chloride pipes (PVC pipes), polyethylene terephthalate pipes (PET pipes), and polypropylene pipes (PP pipes). In the present invention, the dimensions and the tube shape of the inner tube 2 are not limited, and for example, a straight tube shape, a bent tube shape, a branched tube shape, or the like can be used without any problem.

  In the present embodiment, the inner tube 2 made of synthetic resin constitutes a heat-meltable inner tube and melts due to overheating during a fire or the like. In the present invention, the case of softening by heat is also included in the thermal melting.

  The fireproof layer porous sheet 42 arranged on the outer peripheral side of the cladding tube 3 becomes a base material for retaining the fireproof material when impregnated with the fireproof material, and after the fireproof material is cured, the fireproof layer Therefore, in order to impregnate a sufficient refractory material, it is required that a large number of pores exist three-dimensionally (three-dimensionally) and have a required thickness. . Specifically, a nonwoven fabric (including felt) formed by binding or entanglement of fibers, or open-cell foam can be recommended. In the present invention, as the porous sheet 42, a woven fabric or a knitted fabric can be used as long as it has a required thickness and can hold a refractory material.

  Non-woven fabrics can be uniformly impregnated with refractory materials evenly because the fibers are randomly oriented, and the strength against tension and bending is three-dimensionally uniform, so they are excellent in impact resistance and hard to break. A refractory layer 32 can be formed. The material of the fiber used as the material for the nonwoven fabric may be either organic or inorganic. Examples of organic fibers include polyester, polyethylene terephthalate (PET polyester), polyamide (6-nylon, 6,6 nylon, etc.), acrylic, polyvinyl alcohol (vinylon, etc.), polyolefin, cotton, wool, etc. it can. Examples of the inorganic fiber include glass fiber, rock wool, and ceramic fiber. Among these, inorganic fibers are preferable from the viewpoint of improving fire resistance, but it is preferable to use a nonwoven fabric made of synthetic fibers such as polyester and polypropylene from the viewpoint of cost and ease of handling. Since the fireproof performance of the fireproof layer 32 is sufficiently obtained by the fireproof material impregnated in the nonwoven fabric, there is no inconvenience even if a nonwoven fabric made of synthetic fibers is used.

  The nonwoven fabric can be used as it is, but it is preferable to use a felt obtained by compressing a nonwoven fabric, a needle punched nonwoven fabric or a felt. Since the nonwoven fabric has improved shape retention by being compressed or needle punched, the shape retention after impregnation with the refractory material is also improved, and as a result, the roundness of the refractory double-layer tube 1 can be increased.

  Examples of the open cell foam include foamed urethane foam and the like, and a high-strength fireproof layer 32 can be formed by impregnating a fireproof material in the foam as in the case of the nonwoven fabric.

  Among the fireproof layer porous sheets 42, the nonwoven fabric is most excellent in the reinforcing effect.

  On the other hand, as the sound absorbing layer porous sheet 41 constituting the inner sound absorbing layer 31 in the cladding tube 3, the material is preferably the same type as the above fire resistant layer porous sheet 42 constituting the fire resistant layer 32. Can be used.

  In the present embodiment, the thickness of the cladding tube 3 (the sum of the thickness of the fireproof layer 32 and the thickness of the sound absorbing layer 31) is adjusted according to the required fireproof performance. Usually, the total thickness is preferably 3 to 30 mm.

  In the present embodiment, the refractory layer 32 is formed by impregnating the refractory layer porous sheet 42 with a refractory material.

  As a method for impregnating the refractory material, for example, a method by spraying can be cited as a suitable example. That is, a method in which a fire-resistant material is sprayed from the outside to the tubular composite member 4 in which the porous sheets 41 and 42 are wound around the inner tube 2 and the fire-resistant layer porous sheet 42 is impregnated with the fire-resistant material is preferably employed. Can do.

  Specifically, while rotating the tubular composite member 10 about the axis, the spray nozzle is sprayed on the outer peripheral surface of the tubular composite member 10 while spraying a refractory material such as mortar from the spray nozzle of the fireproof material spraying device. It moves along the axial direction of the tubular composite member 10. As a result, the refractory material is evenly sprayed over the entire outer peripheral surface of the tubular composite member 10, and the refractory material is impregnated into the porous sheet 42 for the refractory layer to form the refractory layer 32.

  In the present embodiment, the impregnation method of the refractory material is not particularly limited, and other methods such as coating, pouring, and dipping can be used besides the above-described spraying method.

  As the refractory material, mortar, in particular, cement-based mortar is preferably employed from the viewpoints of strength and density after curing, fire resistance, and the like. Examples of the cement used in the cement-based mortar include, for example, various ordinary Portland cements such as early strength, moderate heat, and very early strength, or blast furnace cement obtained by mixing fly ash and blast furnace slag with these Portland cements. Also, aggregates and various additives can be appropriately mixed with them. Water is mixed with these solid materials and impregnated into the porous sheet 42 for the fireproof layer as a wet material. The viscosity of the refractory material in the wet state is adjusted by the mixing ratio of the solid material and water, and is appropriately set according to the material, surface density, thickness, penetration rate, curing time, etc. of the porous sheets 41 and 42. In general, fiber mortar in which fibers are mixed with cement for the purpose of improving strength is used. However, the fireproof layer 32 of the present invention functions as a reinforcing material because the porous sheet for fireproof layer functions as a reinforcing material. There is no need to mix. Since the fiber mortar may hinder the penetration into the porous sheet for fireproof layer 42, it is preferable not to mix the fibers.

  The refractory layer 32 uniformly contains the fibers and resin constituting the refractory layer porous sheet 42 in the refractory material, and the fibers and resin function as a reinforcing material. For this reason, the refractory layer 32 has characteristics such as high strength, excellent impact resistance, and resistance to cracking.

  The thickness of the refractory layer 32 may be appropriately set according to the thickness of the cladding tube 3 (total thickness of the sound absorbing layer 31 and the refractory layer 32), the purpose of use, the construction location, and the like. As the fireproof layer 32 is thicker, fire resistance is improved, but there is also a problem of weight, and it is preferable to set the thickness to at least 3 mm, preferably about 5 mm to 10 mm. If the refractory layer 32 is made too thick, the weight of the entire refractory double-layer tube 1 increases, which may make transport and construction difficult.

  In this embodiment, in order to prevent the refractory layer 32 from being deformed or to prevent the refractory material from falling off, the outer periphery of the tubular composite member 10 is covered with a stretchable cylindrical mesh sheet or the like. You may make it leave.

  In the present embodiment, the sound absorbing layer 31 is constituted by the sound absorbing layer porous sheet 41 not impregnated with a refractory material. The sound absorbing layer 31 is preferably set to a thickness of at least 1 mm or more, preferably about 3 mm to 15 mm in order to ensure good sound absorption.

  In the present embodiment, the density of the fireproof layer porous sheet 42 is preferably set lower than the density of the sound absorbing layer porous sheet 41. That is, since the fireproof layer porous sheet 42 is impregnated with a fireproof material to form the fireproof layer 32, the fireproof layer porous sheet 42 to be impregnated with the fireproof material is replaced with a low-density nonwoven fabric or the like. The sound absorbing layer porous sheet 41 that is configured by a low-density layer and does not want to be impregnated with a refractory material is configured by a high-density layer such as a non-woven fabric having a high density. Since the low density layer is more easily impregnated with the refractory material than the high density layer, only the low density fire resistant layer porous sheet 42 can be impregnated with the refractory material reliably. Thus, by using the porous sheets 41 and 42 of the low density layer and the high density layer, the impregnation degree of the refractory material can be accurately controlled, and the refractory layer 32 and the sound absorbing layer 31 can be accurately applied to desired portions. Can be formed.

  In the present embodiment, as will be described in detail later, the sound absorbing layer porous sheet 41 and the fireproof layer porous sheet 42 are configured by a single porous sheet that is physically connected. May be.

  The fireproof double-layer pipe 1 of the present embodiment having the above configuration is used as a drain pipe in an apartment house such as an apartment. In this case, the sound generated by the water flowing inside (water flow sound) is absorbed by the sound absorbing layer 31, and the water flow sound that has passed through the sound absorbing layer 31 is sound-insulated and reflected by the fireproof layer 32. Therefore, water flow sound does not leak out of the pipe. Furthermore, a predetermined fire resistance performance can be reliably obtained by the fire resistance layer 32 provided on the outer peripheral surface of the sound absorbing layer 31.

  The collective pipe joint 7 to which the fireproof double-layer pipe 1 is connected is attached in the through hole of the concrete slab. This collective pipe joint 7 is provided with a pipe connecting portion 71 to which the above-mentioned refractory double-layer pipe 1 is connected at the lower end portion, and a plurality of pipe connecting portions are provided on the upper portion (not shown). Each can be connected to a pipe such as a fireproof double-layer pipe similar to the above.

  The pipe connecting portion 71 is opened downward and has an inner diameter dimension corresponding to an outer diameter dimension of the inner pipe 2 in the fireproof two-layer pipe 1. The connection end portion 25 can be inserted. Further, a flange portion 72 is integrally formed on the outer periphery of the opening end (lower end) of the pipe connecting portion 71 so as to protrude outward.

  In order to connect the fireproof two-layer pipe 1 to the collecting pipe joint 7, a metal push ring 75 is fitted to the outside of the connection end portion 25 of the inner pipe 2 in the fireproof two-layer pipe 1, while in the collecting pipe joint 7. A ring-shaped rubber packing 76 is disposed on the inner periphery of the opening edge of the pipe connecting portion 71. And the connection end part 25 of the fireproof two-layer pipe 1 is inserted into the pipe connection part 71 of the collecting pipe joint 7, and the rubber packing 76 is connected to the outer peripheral surface of the connecting end part 25 of the fireproof two-layer pipe 1 and the collecting pipe joint 7. It arrange | positions between the opening edge part internal peripheral surfaces of the pipe connection part 71 in. In this state, the press ring 75 is pressed against the flange portion 72 side by fastening means 77 including bolts and nuts, and the rubber packing 76 is placed between the inner periphery of the opening edge of the pipe connection portion 71 and the outer peripheral surface of the inner tube 2. Press fit into. Thereby, the fireproof two-layer pipe 1 is connected and fixed to the collecting pipe joint 7.

  In the fireproof double-layer pipe 1 connected and fixed to the collecting pipe joint 7 in this way, the cladding pipe 3 is arranged up to the vicinity of the push ring 75 in the collecting pipe joint 7.

  In the present embodiment, the push ring 75 is handled as one of the members constituting the collecting pipe joint 7.

  FIG. 2 is a perspective view showing the fire prevention device 5 employed in the pipe connection structure of the present embodiment. As shown in FIGS. 1 and 2, the fire prevention device 5 provided in the vicinity of the collecting pipe joint 7 in the fireproof double-layer pipe 1 includes a thermal expansion member 50 and a holding frame 6 that holds the thermal expansion member 50. Yes.

  The holding frame 6 includes an annular metal frame main body 61 and a hook 65 for supporting the frame main body 61 on the collecting pipe joint 7. In the present embodiment, the holding frame 6 constitutes a holding member.

  The frame main body 61 is formed with ribs 62 and 62 projecting inwardly on the entire circumference of both upper and lower ends inside. Further, a groove-like thermal expansion member accommodating recess 63 is formed between the upper and lower ribs 62, 62, which is continuous in the circumferential direction and opens inward.

  And in this recessed part 63, the thermal expansion member 50 shape | molded by the annular | circular shape is accommodated and hold | maintained. In the present embodiment, the inner peripheral surface of the thermal expansion member 50 is disposed on the inner side of the tips (inner ends) of the upper and lower ribs 62, 62.

  In this thermal expansion member 50, the inner diameter dimension is formed larger than the outer diameter dimension of the cladding tube 3 of the fireproof double-layer tube 1, and the thermal expansion member 50, that is, the frame main body 61 holding the thermal expansion member 50. Can be fitted to the outside of the cladding tube 3 of the fireproof double-layer tube 1.

  In this embodiment, when the thermal expansion member 50 is heated by heat at the time of a fire, that is, at the time of overheating, the thermal expansion member 50 expands 3 to 50 times and retains fire resistance in an expanded state.

  In the present embodiment, as such a thermal expansion member 50, a synthetic resin system in which a thermal expansion carbon (thermal expansion graphite) is contained in a synthetic resin such as an epoxy resin or a polyethylene resin, or a synthesis such as EPDM is used. A synthetic rubber-based rubber in which heat-expandable carbon (heat-expandable graphite) is contained in rubber can be suitably used.

  Needless to say, in the present invention, the thermal expansion member 50 may be appropriately mixed with an additive such as a filler as necessary.

  In the present embodiment, the thermal expansion member 50 is made of thermal expansion rubber or the like that has heat insulation properties and expands due to the heat of a fire.

  A plurality of hooks 65 are provided on the outer peripheral surface of the frame body 61 at intervals in the circumferential direction, and three hooks 65 are provided in the present embodiment. Each hook 65 is arranged such that its lower end is fixed to the outer peripheral surface of the frame body 61 and extends upward and protrudes upward. Further, a claw 66 is formed at the upper end of each hook 65 by bending the upper end inward. Each hook 65 has elasticity, and is configured to be elastically deformable so that the upper side opens outward with the lower end as a fulcrum.

  When the fireproof device 5 is attached to the pipe connection structure, the fireproof device 5 is attached to the outer periphery of the connection side end of the fireproof double-layer tube 1 in advance before connecting the fireproof double-layer tube 1 to the collecting pipe joint 7. Fit it in. In this case, the side from which the hook 65 protrudes is arranged as the upper side, that is, the connection side with the collecting pipe joint 7. As already described in this state, the fireproof two-layer pipe 1 is connected to the collecting pipe joint 7.

  Thereafter, the fire protection device 5 is lifted to a position corresponding to the space between the flange portion 72 and the push ring 75 of the collecting pipe joint 7 while pushing each hook 65 of the fire protection device 5 outward against the elastic force. Then, the push-opening of each hook 65 is released, and each claw 66 is inserted between the flange portion 72 and the push ring 75 of the collecting pipe joint 7 and hooked by the elastic restoring force of each hook 65. Thereby, the fireproof device 5 is assembled to the pipe connection structure in a state where the thermal expansion member 50 is disposed on the outer peripheral surface of the cladding tube 3 at the end of the fireproof double-layer tube 1.

  In the above description, the fireproof device 5 is externally fitted to the fireproof double-layer pipe 1 in advance before the fireproof double-layer pipe 1 is connected to the collecting pipe joint 7. The assembly procedure of the two-layer pipe 1 and the fire protection device 5 is not limited. For example, the fireproof device 5 may be assembled after connecting the fireproof two-layer pipe 1 to the collecting pipe joint 7. That is, the upper end portion (one end portion) is slid from the lower end portion (the other end portion) of the refractory double-layer tube 1 connected to the collecting pipe joint 7 to the upper end portion of the refractory double-layer tube 1 by externally fitting the fire prevention device 5. Then, the fire prevention device 5 may be assembled to the upper end portion of the fireproof double-layer tube 1 in the same manner as described above.

  As described above, according to the pipe connection structure of the present embodiment, the thermal expansion member 50 is not directly wound around the outer peripheral surface of the inner pipe 2 which is a synthetic resin pipe, but the thermal expansion member 50 is connected to the refractory double-layer pipe 1. Is disposed outside the cladding tube 3, that is, outside the nonwoven fabric or the like that is the porous sheets 41 and 42, or the mortar that is a refractory material. For this reason, when the thermal expansion member 50 expands inward due to the occurrence of a fire, the cladding tube 3 is crushed along with the expansion, and the nonwoven fabric or mortar constituting the cladding tube 3 is thermally expanded. 50, and the mixed member closes the pipe line.

  Among these mixing members, for example, the non-woven fabric functions as a holding base material and a reinforcing material for the crushed mortar and the heat-insulating thermal expansion member 50, so that the state of the mixing member is securely held and the state where the pipe is blocked is maintained. Is done. For this reason, it can prevent that the mixing member which obstruct | occluded the pipe line collapses, and flame-shielding property falls, and can maintain the outstanding flame-shielding property reliably. Furthermore, since the mortar of the mixing member has sufficient fire resistance on its own, it also functions as an aggregate or reinforcing material for the mixing member while improving the fire resistance, so that the mixing member blocking the pipe line collapses. Therefore, it is possible to more reliably prevent a malfunction and maintain sufficient fire resistance more reliably. Thus, flameproofness and fire resistance can be improved, and fireproofness can be improved.

  Furthermore, since the thermal expansion member 50 is restrained from the outside by the frame main body 61 of the holding frame 6, it can be surely expanded to the inside without expanding to the outside and the pipe line can be reliably closed, further improving fire resistance. Can be made.

  Moreover, the fire prevention device 5 of the present embodiment can be easily attached simply by hooking the hook 65 to the collecting pipe joint 7, and as a result, the assembly work of the entire pipe connection structure can be easily performed.

  Furthermore, the fire protection device 5 of the present embodiment is made of a material constituting the cladding tube 3 of the fireproof double-layer tube 1, such as a nonwoven fabric or mortar, such as a holding base material, fireproof material, aggregate, reinforcing material, etc. at the time of fire. Since it is used as a fire-proof material, it is not necessary to increase the amount of fire-resistant material or to incorporate a new fire-proof material, which can simplify the structure and reduce the size and weight of the device. Cost can also be reduced.

  In the above embodiment, the fire protection device 5 is attached to the pipe by hooking. However, in the present invention, the means for attaching the fire protection device 5 to the pipe is not particularly limited. For example, the fire prevention device 5 may be attached to the collecting pipe joint 7 or the fireproof two-layer pipe 1 so as to be wound with a wire such as a wire.

  Furthermore, in the said embodiment, although the hook 65 of the fire prevention apparatus 5 is inserted between the flange part 72 and the push ring 75 of the collecting pipe joint 7, it is not restricted only to it, In this invention, the fire prevention apparatus 5 of The hook 65 may be configured to be hooked on the upper surface of the flange portion of the collecting pipe joint 7.

  In the above-described embodiment, the fire protection device 5 is provided with the holding frame 6 that holds the thermal expansion member 5. However, the present invention is not limited to this, and in the present invention, the fire protection device is heated without including the holding frame. The thermal expansion member (fire protection device) may be wound around the fireproof double-layer tube 1 only with the expansion member.

  Furthermore, in the said embodiment, although the cladding tube 3 used what was formed in the two-layer structure of the sound absorption layer 31 and the fireproof layer 32 as the fireproof two-layer pipe 1, it is not restricted only to it, In this invention, As the refractory double-layered tube, a tube in which only the refractory layer such as mortar is laminated on the outer periphery of the inner tube 2 can be adopted. In this case, since the refractory layer such as mortar is crushed and mixed in the expanded thermal expansion member at the time of fire, the mixed refractory layer improves the fire resistance and also functions as an aggregate and a reinforcing material. , Fire resistance can be improved.

  In the above-described embodiment, the sound absorbing layer porous sheet 41 and the fireproof layer porous sheet 42 are configured by separate members that are not physically connected. However, the present invention is not limited thereto, and in the present invention, the sound absorbing layer The porous sheet 41 for layers and the porous sheet 42 for refractory layers can be constituted by the same porous sheet (one porous sheet) that is physically connected. That is, a thick porous sheet is wound around the outer periphery of the inner tube 2, and only the outer half of the porous sheet is impregnated with the refractory material. And while forming the outer peripheral part which the refractory material impregnated among the thick porous sheets as a fireproof layer, the inner peripheral part which the refractory material is not impregnated can also be comprised as a sound absorption layer.

  In the above embodiment, the case where the fireproof double-layer pipe is connected to a collecting pipe joint to which pipes such as three or more fireproof double-layer pipes are connected has been described as an example, but the present invention is not limited thereto. Can also be applied to straight and elbow type pipe joints that only connect two pipes.

  Moreover, in the said embodiment, although the case where the fire prevention apparatus 5 was arrange | positioned in the vicinity of the pipe joint in the fireproof two-layer pipe 1 was mentioned as an example, it was not restricted to that, In this invention, a fireproof apparatus is a fireproof two-layer pipe. You may make it arrange | position in the position spaced apart from the pipe joint in.

  The fireproof double-layer fireproof structure of the present invention can be applied to drain pipes and ventilation pipes in buildings such as apartment buildings.

1: Refractory double-layer pipe 2: Inner pipe 25: Connection end (upper end)
3: cladding tube 32: fireproof layer 41: sound absorbing layer porous sheet 42: fireproof layer porous sheet 5: fire protection device 50: thermal expansion member 6: holding frame (holding member)
65: Hook 7: Collecting pipe joint (pipe joint)

Claims (7)

A fire-resistant structure of a fire-resistant two-layer pipe provided with a fire-resistant layer made of a fire-resistant material on the outer periphery of a heat-meltable inner pipe,
A fireproof structure for a fireproof two-layer pipe, wherein a fireproof device including a heat-insulating thermal expansion member that expands and closes a pipe line when overheated is provided on the outer periphery of the fireproof layer in the fireproof two-layer pipe.   The fireproof structure of a fireproof double-layered tube according to claim 1, wherein the fireproof device includes a metal holding member that covers an outer periphery of the thermal expansion member and holds the thermal expansion member. A pipe joint connected to an end of the fireproof double-layer pipe,
The fireproof structure of a fireproof two-layer pipe according to claim 1 or 2, wherein the fireproof device is supported by the pipe joint. An upper end portion of the refractory double-layer pipe disposed along the vertical direction is connected to the pipe joint;
The fireproof structure of the fireproof two-layer pipe according to claim 3, wherein the fireproof device is hung on the pipe joint by hooking a hook attached to the outer peripheral surface of the fireproof apparatus to the pipe joint.   The fireproof structure of the fireproof two-layer pipe according to any one of claims 1 to 4, wherein the fireproof layer is formed of a porous sheet impregnated with a fireproof material.   The fireproof double-layer tube according to any one of claims 1 to 5, wherein a sound absorbing layer formed of a porous sheet is provided between the inner tube and the fireproof layer in the fireproof double-layer tube. Fireproof structure. A fire-proof device attached to a fire-resistant double-layer pipe provided with a fire-resistant layer made of a fire-resistant material on the outer periphery of a heat-meltable inner pipe,
A fireproof device comprising a heat insulating thermal expansion member provided on an outer periphery of the fireproof layer in the fireproof two-layer tube and expanding when overheated to close the pipe.

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